Hybrid capacitive force sensors
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United States of America Patent
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Dec 17, 2013
Grant Date -
Jul 4, 2013
app pub date -
Oct 1, 2012
filing date -
Sep 30, 2011
priority date (Note) -
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Abstract
Hybrid force sensitive input devices are formed as a membrane assembly that is capable of detecting capacitive presence near the sensor surface as well as pressure inputs and varying applications of pressure to the sensor surface. As a capacitive sensor, the electrical charge of a user's hand, finger or other extremity is sensed by the conductive layers of the sensor as a function of the input extremity's location and proximity to the sensor surface. As a force sensor, a user's input contact with the sensor surface is detectable when conductive elements on apposing substrates are forced into contact when input force is applied. Increasing the applied force increases the number of conductive particles making contact allowing the electrons to travel from one conductive trace on a first substrate through the contacting conductive patches to a perpendicular conductive trace on a second substrate.
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